Oil-gas burner.



W. MITCHELL.

OIL GAS BURNER. APPLICATION man JUNE 1|. 1914.

Patented A131220, 1915.

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/VILLIS MITCHELL, OF MALDEN, MASSACHUSETTS, ASSIGNOR TO WILLIS MITCHELL COMPANY, INC., 0F NEW YORK, N. Y., A CORPORATON 0F NEW YORK.

OIL-GAS BURNER.

Specication of Letters latent.

Patentes npr. 2o, reis.

Application filed June 11, 1914. Serial No. 844,425.

T0 all whom it may concern Be it known that l, lVrLLrs MITCHELL, a citizen of the United States, residing at Malden, in the county of Middlesex and StateV of Massachusetts, have invented certain new and useful Improvements in Oil-Gas Burners, of which the following is a. speciiication. Y

The chief object of this invention is to improve cylindrical and similar burners used with fuel gas generators and steam generators, by providing convenient means for regulating at will the proportion of air andffuel gas supplied to them, by causing a peculiar and effective eddying movement of the gas and air after their meeting and while they pass along the interior of the inner burner chamber so that the particles may be brought into intimate contact and thoroughly heated; to provide against heating the said inner chamber injuriously: and to provide for properly deflecting the gas and air evenly from the rear of the burner into the combustion space or chamber, when it passes through many small openings, forming ignitible jets.

The said invention consists in the construction, arrangement and combination of parts for effecting these ends, as hereinafter more particularly set forth.

In the accompanying drawings: Figure 1 represents a longitudinal central section through a burner embodying my invention, showing also in elevation the tubular nozzlesupporting arm of the gas generator which supports the fuel inlet of said burner; Fig. 2, a detail rear elevation of the block to which the air inlet guide plate is attached; and Fig. 3 represents a detail view of the concave deflector.

This burner consists primarily of a cylindrical inner tube or chamber 1 having a double Wall 2 concentrically arranged within a longer outer casing 3, which has many holes 4 therein for the emission of gas to be there ignited. Said casing extends beyond the open rear end of said inner chamber, its own rear end being closed. An annular wall 5 closes the front of the burner space or chamber 6 between double wall 2 and casing 3, also the dead-air space 2O between the two shells of said wall 2. This annular wall may be attached to the front-wall 7 of the exterior casing of the device. A concave deflector 8 attached to the inner face of :the

rear end of the said outer casing and presented toward the open rear end of the said innerl chamber directs the heated and aerated gas evenly into the cylindrical burner chamber 6, whence it issues through said burner holes 4 in jets of three or four inches in length, which are exactly uniform in size and appearance and heat throughout the length of the burner. The jets which issue from the lower part thereof are directed on the generator 9 below it, which supplies said burner through its tubular arm 10 and nozzle 11 governed by needle-valve 12 having stuffing box 13. The other jets of said burner may be directed on a surrounding series of water-tube helices of a steam generator or other structures where the action of heat is desired. There is no exit from the said burner space except these burner holes 4; and no inlet for it except that at the rear end of the inner chamber l, which has almost exactly the same cubic capacity as said burner chamber. The fuel, in the form of fixed dry gas from said generator, enters the said inner chamber from said nozzle through a iixed-outwardly-flaring trumpetform fuel inlet guide 14, this guide being supported on an arm, plate or bracket 15 fastened to the tubular nozzle-supporting arm 10. An air-inlet guide 16 of like form (both being of polished metal) surrounds said fuel inlet, being attached to the inner face of a cylindrical conoidally recessed block 17 iitted adjustablyinthe inlet end of said inner chamber and held thereto by springs 17'a which set into sockets of said block. By moving this said air-inlet guide and its plate backward or forward by means of a handle 1"(b attached to said block, the interval between the two guides is increased or decreased, thereby varying the proportion of air to gas in said chamber by reason of the inwardly tapering form of these two inlet guides and the fact that this interval is the only means for admitting air to the burner, excepting of course the small amount of air drawn in by the fuel through the inlet guide 14. The rear end of air inlet guide 16 extends more or less beyond that of fuelinlet guide 14 according to the adjustment of the former, and thus provides a space wherein the two currents of air and gas can come into close contact. The rear face of the said block is formed into an annular trough or concavity 18, which will cause little circular eddies in the mingled current,

' these eddies, following along the wall of the Y jected by the nozzle through said fuel inlet in so strong and rapid a jet that it makes a strenuous draft of air through the surrounding air inlet, no blower being required to keep up a continuous and suflicient supply of air, providing abundant oxygen intimately mixed with the particles of gas, the two substances issuing as a homogeneous gaseous fluid at each of the burner holes, in the best possible -condition for perfect ignition.

If the wall of the inner chamber were single and of good heat-conductivity the burner might overheat the gaseous contents of such chamber, causing premature ignition or at least injuring its quality. To prevent this is the function of the poorly conducting dead air space 20 interposed between said inner chamber and the surrounding burner by the construction of the double wall of the former.

This burner utilizes to thebest advantage, and with hardly any waste, the heating value of the fixed hydrocarbon gas supplied by the gas generator; and the burner and gas generator together make an efficient and satisfactory means for producing gas from the cruder hydrocarbon oils and profitably consuming the same. Of coursethey may lbe used wherever heat or light are required for any purpose; but one of their most important applications is, as shown, withm the casing of a steam generator for the purpose of heatingits water helices.

The products of combustion of this burner are inoffensive in odor and slight in volume, by reason of the perfect clarification and oxygenation of the fuel and the thorough combustion at the burner holes.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. An oil gas burner having an elongated combustion chamber and an elongated concentric inner chamber, communicating at its rear end therewith, in combination with a fixed tapering fuel inlet in its forward end and a movable part arranged in this forward end between said fuel inlet and the wall of said inner chamber and 4forming an adjustable air inlet between it and said fuel inlet, these inlets discharging directly and without obstruction into the said inner chamber.

2. An oil gas burner having an elongated approximately cylindrical chamber, in combination with adjustable means forming the outer wall of an air inlet fitted into one end of said chamber and a fuel inlet forming also the inner wall of said air inlet, said fuel being shorter than the said outer wall of saidair inlet, to provide a space beyond the former where the air may mingle with the gas before issuing into the interior of said chamber, the inner ends of said inlets being unobstructed and permitting direct inflow of gas and air.

3. An oil gas burner comprising an approximately cylindrical velongated inner chamber in combination with a fuel inlet directed into one end thereof and an adjustable air inlet surrounding said fuel inlet and arranged within the forward end of said inner chamber, said inlets discharging directly and freely into said inner chamber.

4. An elongated inner chamber, in combination with a concentric exterior burner chamber communicating therewith, a conoidally recessed block conforming externally to the 4internal shape of said inner chamber and adjustable longitudinally in the inlet end thereof, a trumpet-form air inlet guide carried by the inner face of said block, and a fixed fuel inlet guideof like form arranged centrally within the former guide, but extending less far inward to leave a space at its inner end where the two iiuid streams may come into contact before entering the inner chamber of the burner.Y

5. In combination with the inner chamber of a burner and inlets for air and gas Y annular concave inner `face for the purposeof creating eddies in the flowing current of gas and air and causing more homogeneous mingling and heating.

6. In an oil gas burner, the combination with a fixed fuel inlet guide of an exterior concentric air-inlet guide forming the airinlet between them, and an adjustable block carrying the latter guide having its inner face concave in form, itsadjustability serving to regulate the admission of air and such concave form serving to create eddies in the current of gas and air.

7. In an oil gas burner, the combination with an exterior chamber having a perforated wall, of an inner chamber provided with a fuel-inlet and an air-inlet and communicating with said burner chamber but provided with a double wall and intervening dead-air space to guard against overheating by the burner.

8. In an oil gas burner, the combination with an outer burner chamber, an inner chamber communicating at the rear end therewith, and an intervening. dead air space, all being approximately cylindrical in form, of a concave deflector arranged in the rear end of said burner and facing the open rear end of the said inner chamber to receive the current of gas and air therefrom and direct it evenly into the burner chamber.

9. In an oil gas burner, the combination with an outer burner chamber of approximately cylindrical form and an inner chamber of like form concentric therewith, of a concave deflector arranged in the rear end of said burner opposite the open rear end of said inner chamber, to receive the current of air and gas therefrom and direct it into said burner chamber.

10. An elongated inner chamber, in combination with a concentric exterior burner chamber communicating therewith, a conoidally recessed block conforming externally to the internal shape of said inner chamber and adjustable longitudinally in the inlet end thereof, a trumpet-form airinlet guide carried by the inner face of said block, and a fixed fuel inlet guide of like form arranged centrally within the former guide, the said block being provided with a handle and with resilient devices for holding it at any point to which it may be adjusted.

11. An elongated inner chamber, in combination with an exterior burner chamber communicating therewith, a conoidally recessed block litting in the inlet end of said inner chamber and adjustable backward and forward therein, a metallic lining for said block constituting the air-inlet guide or outer wall of the air-inlet, a iXed trumpet form and fuel inlet guide arranged concentrically within said air inlet and constituting the inner wall of the same.

12. In combination with the outer burner chamber and communicating elongated inner chamber, air and gas inlet devices discharging directly into one end of the latter chamber and including a block having a lining which presents a trumpet-form face inwardly and a concavity rearwardly as set forth.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIS MITCHELL. Witnesses:

CHARLES F. EDDY, CHARLES F. DANIELS.

G'opies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

